by Stewart, V, Marsh, S, Kingwell, R, Pannell, D, Abadi, A, Schilizzi, S
Published in The journal of agricultural education and extension (01.11.2000)

by Horwith, B
Published in Bioscience (01.05.1985)

by Curry, J. (Pan Livestock Service, Reading, UK.)
Published in Human ecology : an interdisciplinary journal (01.06.1996)

by Clark, Gregory
Published in Explorations in economic history (01.07.1988)

by Fujimoto, T., Osaka Univ. of Economics (Japan)
Published in Journal of Rural Problems (25.09.2008)

by NAKAJIMA, Kiichi
Published in Journal of Rural Economics (26.09.2000)

by GONZALEZ SOSA, ENRIQUE
Year of Publication 14.07.2011

by HAZARD, MICHEL
Year of Publication 01.07.1993